Pump



I. M. KELLEY.

PUMP.

APPLICATION FILED 'AUG. 30, I9IB- Patented Oct. 11, 1921.

JOHN M, KELLEY, GE 1120 EESTER, NEW YORK.

PUMP.

Original application filed April 8, 1918,

T 0 all whom it may concern Be it known that 1, JOHN M. KELLEY, acitizen of the United States, and resident of Rochester, in the countyof Monroe and State of New York, haveinvented certain new and us fulImprovements in Pumps, of which the following is a specification.

The presentinvention relates to pumps, the illustrated constructionbeing designed for holding a fire extinguishing liquid with in thecylinder in rear of the piston until such time that it is desired to usethe liquid, when the piston is drawn outwardly causing the liquid toflow in front of the piston through a passageway in the piston forejection when the piston is moved in the opposite direction. Thisapplication is a division of an application filed by me on April 8,1918, Serial No. 227,868.

An object of this invention is to provide a. piston loosely mounted onthe piston roc, and provided with a passageway which, when the pistonrod is moved outwardly, will beopened, due to the fact that the pistonis retarded by frictional engagement with the cylinder walls, and willbe closed when the piston rod is moved inwardly, due to the same cause.A further object of the invention is to provide an adjustable reliei'passage in the piston permitting a part of the liquid to flow to therear of the piston, so that a movement oi the piston may take place,notwithstanding the restricted size of the discharge opening as comparedwith the pressure area of the piston. Still another object ottheinvention is to provide means for admitting air to the rear face of thepiston, the latter moves inwardly, this means being entirely closedwhile the piston is in its innermost position, so that, when the deviceis not in use, there will be no danger of leakage through the air inletpassage. A still further object of the invention is to provide animproved air compressing chamber associated with the discharge passageof the lire extinguisher to prevent sputtering due to the varyingpressure on the piston. A still further object of the in vention is toprovide an air compressing chamber which is so constructed that it willnot collect any of the liquid passing from the discharge orifice, and atthe same time will be housed by the cylinder.

To these and other ends the invention consists of certain parts andcombinations of Specification of Letters Patent.

Serial No. 227

' Serial No. 252,166.

Opn

,ooo. Divided and this application filed. August 30,

parts, all of which will be hereinafter described, the novel featuresbeing pointed out in the appended claims. I

In the drawings Figure l is an axial section through a fireextinguisherconstructed in accordance with the present invention;

Fig. 2 is a. detail view showing the inlet end of the air inlet passageopen, a

Fig. 3 is a detail sectional view, showing the piston. shifted on apiston rodin such a manner as to open the passageway;

Fig. l an enlarged detail view of the adjustable relief passage;

Fig. 5 is a detail view of the upper face of the piston; and

Fig. 6 is an enlarged detail View of the discharge passage.

Referring more particularly to the drawings, 1 indicates the openendedtubular member of the cylinder, which alsoembodies a head 2 providedwith a packing gland 3 and a filling opening closed by a. plug l. Thecylinder also embodies a head 5 provided with a discharge passage which,in this instance, is formed by a tube 6 extending through a chamber 7 inthe head 5 and having a restricted portion 6 and a relatively widerportion 6". This chamber 7 in this instance, incloses an air compressingchamber 8 which is in the form of a long narrow tube coiled about thetube 6 with one end closed and the other end opening at f) to the widerportion 6" of the discharge passage in the tube 6. Itis apparent thatany liquid flowing through the discharge passage under pressure willcompress the air in the chamber 8, and this compression reacts on theliquid in such a manner as to cause such liquid to flow from the pump ina steady stream, thus preventing any sputtering cue to an unevenpressure on the piston. Owing-- to the fact that the air compressionchamber 8 is in the form of a coiled tube, it is impossible for anyliquid passing Patented Get. ill, 1921.

through the discharge passageway to flow 'metal plate 10, against whicha ring 11 of this instance, embodies a packing material, such as felt,rests, said ring being centered by a ring-shaped mem ber 12 abutting theplate 10 within the packing ring 11. The packing ring may be held to theplate 10 by a plate 13 which has a plurality of laterally-bent fingers14: at its edges, said fin ers centering the ring 12 and also engagingand overhanging the packing ring 11, thus acting on the ring not only tohold it to the plate 10, but to expand such ring, due to the fact thatthe fingers 14 are of spring material. Eyelets 15 may pass through theplates 18 and 10 to secure them together, and at the same time serve toprov'ide passageways 16, other passageways being provided by registeringopenings in both plates so that an annular series of passageways isformed. The spring fingers 14 ar also adapted to engage with an annularspreading device 17 formed on the head 5 to cooperate'with the lingersin such a manner as to move them outwardly in order to press the packingring 11 firmly against the walls of the cylinder 1, thus preventing thepassage of liquid past the packing ring". The construction of thispiston is claimed in my aforesaid application .,-'.'227,868, filed April8, 1918.

The piston has a slight movement on the piston rod between a disk 18 onthe rod and a nut 19 on said rod. This movement is provided in orderthat when the piston rod is moved outwardly the piston, owing, to itsfrictional contact with the side walls of the cylinder, will not moveuntil the nut 19 cooperates with it, and in this way the annular seat20'which surrounds the passageways 16 will move out of cooperation withthe disk 18, thus permitting the fluid or liquid which is stored withinthe cylinder 1 above the piston to flow to the inner or under side ofthe piston. Then the piston is moved in the opposite direction, thisfrictional contact between the piston and the cylinder walls will holdthe piston until such time that the disk 18 cooperates with the annularseat 20, thus closing the passageway and permitting the liquid to beforced by the piston through the discharge tube 6. While the piston isin its innermost or lower position, the passageway 16 may be closed, andthis closing may be eifected by a tapered end 21 of an extension on thepiston rod coeperating with the seat 22 in the discharge passageway,said seat being positioned on the inner side of the end 9 of the aircompression chamber. The'piston rod extension may be also screw-threadedat 23 in order that the nut 19 may be fitted thereon, and also that theinterior threaded walls of the tube 6 maybe engaged to lock the pistonin its innermost position, where its packing ring 11 isforced outwardlyagainstthe walls of the cylinder by the spreader'l'i'.

It is desirable to admit air into the cylinder in rear of the piston, asthe latter moves iorwardly or toward the discharge orifice. lrleretoforean air inlet has been provided in the cylinder head, but it has beenfound that the valve which closes the air inlet will accidentally becomeopened, thus permitting the escape of the liquid contained in thecylinder above the head. To prevent this wasting of the liquid there isprovided an air inlet which will be positively closed when the piston isin its innermost position, and the liquid is in the cylinder above thepiston. To secure these results, the piston rod may be formed by a tube24 working through the packing gland 8 and having a knob 25'at its outerend. The inner end of this tube 2a is sorew-threadedv and engages withthe internally-threaded walls of a chamber 26 formed in a casting 27,which carries the disk 18 and the screw-threaded portion 23. Thischamber 26 has a port 28 opening to the cylinder, while the tubular rod2d has a port 29 which, when the rod is in the position shown in Fig. 1,lies within the packing gland 3 so that the air inlet passage is closedto the interior of the cylinder. When the rod is withdrawn this port 29is carried beyond the packing gland and permits the entrance of air byway of the tube and the port- 28. A ball'valve 30 is situated within thechamber 26 and seats against the it has been found that ina device ofthis character where a large piston is provided with a small dlschargeorifice or outlet from the cylinder, the movement of the piston is veryslow, and to increase the speed of the piston a relief passage 32 isprovided in the piston. in this instance, this relief passage is formedby a slot in a screw 33 which is adjustably mounted in the piston plate10, so that the size of the relief passage may be varied in order tosecure the most effective action.

in the use of the invention, the parts are adjusted to the positionsshown in Fig. 1, and the filling plug 1 being removed, the fireextinguisher fluid, such as carbon-tetrachlorid, is introd: cod into thecylinder above be piston, after which the plug 4: is fitted in thefilling opening and the extinguisher is ready for use. When it isdesired to use the extinguisher, the piston rod is turned so as todisengage the screw-threaded projecting end from the walls of thedischarge tube 6, thus opening the discharge passageway. After thepiston rod has been disengaged cm the tube 6, it is pulled outwardly,thus ausing the piston to move on the rod, due

to the frictional engagement between the packing ring 11 and theinterior walls of the c linder 1 thus 0 ienin the aassa 'ewa s 16.

. a r; l e;

Further movement! of the piston rod will cause the piston to traveltoward the upper or rear end of the cylinder, thus causing the liquid toflow to the opposite face of the piston. After the piston has been movedto the limits of its movement,the pistonrod is forced in the oppositedirection, thus bringing the disk 18 against the ring 20 and closing thepassageways 16, so that the force of the from the cylinder through thedischarge tube 6. The pressure on the liquid causes a compression of theair in the air compression tube 8, and this compressed air chamber tendsto maintain a steady flow of the liquid from the discharge tubenotwithstanding an unequal pressure on the piston.

During the movement of the piston, a small amount of the liquic travelsthrough the relint passage 32 and prevents the choking action in thedischarge orifice 6. When the piston is in its innermost position, thepacking 11 is held in lirm engagement with the walls of the cylinder bythe spreading ring which acts on the spring arms or fingers 14 to forcethe packing ring 11 outwardly. The liquid in the chamber 1 is, duringthe nonuse of the extinguisher, held from lealtage by way of the airinlet port which relieves the vacuum on the upper face of the piston.

From the foregoing it will be seen that there has been provided a pumpin which the piston has a movement on the piston rod to permit the fluidto liow from one side thereof to the other in ord r to pass out of thedischarge passage. A packing ring is provided which dispenses with thecupped piston, and yet firmly coiiperates with the walls of thecylinder. Leakage of-the fluid in the cylinder is prevented by providingthe air intake passage in the piston rod, and moving the intake end ofthe passage to a position where it will be closed. A, compressionchamber is provided which maintains a steady flow from the dischargepassage, and yet does not collect any materia amount of the liquid inany position in which the extinguisher is held.

What I claim as my invention and desire to secure by Letters Patentis 1. A pump comprising a cylinder provided with a discharge passagehaving a restricted portion, a piston operating in said cylinder, meansfor closing the discharge passage, and an air compression chamberleading from said discharge passage between the closed portion of thesaid passage and the restricted portion.

piston acts on the liquid and ejects it' 2. A pump comprising a cylinderhaving a head provided with a discharge passage having a restrictedportion, a piston operating in the cylinder, a piston rod for operatingthe piston, means carried with the rod for closing the dischargepassage, and an aircoinpression chamber inclosed by the head and leadingfrom the discharge passage between the closed portion and the restrictedportion.

A pump comprising a cylinder having a discharge passage having arestricted portion, a piston operating in the cylinder, means forclosing the discharge passage, and a coiled air compression chambercommunicating with the discharge passage between the closed portion andthe restricted portion.

A pump comprising a cylinder having a hollow head witha discharge tubeprojecting therein and provided with a seat and a restricted portion, apiston operating in the cylinder, means carried by the piston forcooperating with the seat to close the discharge tube, and an air comprssion chamber coiled about the discharge tube in the head andcommunicating with the discharge tube between the seat and therestricted portion.

in a pump, a cylinder having a packing gliuid in one head and adischarge opening in its opposite head, a piston operating in thecylinder, and a tubular piston rod having an. inlet and a dischargeport, the inlet being so situated that it is closed by the packing glandwhen the piston rod is moved to innermost position. i

6. In a pump, a cylinder having a pading gland in one head, a pistonoperating in the cylinder, a piston rod comprising a part to which thepiston is secured formed with a valve chamber having a lateral dischargeport and also a tube having its inner end engaging the inner wall ofsaid chamber and forming a valve seat, said tube being provided with aninlet port which will be closed by the packing gland when the piston ismoved to an inner position, and a ball valvein the chamber] 7 T. A pumpof the type embodying a cylinder formed with a discharge opening, and apiston operating in the cylinder to force the liquid through thedischarge opening and provided with a valved passageway by which theliquid may flow from one side of the piston to the other when the pistonis moved away from the discnarge opening, distin guished by anadjustable relief passageway in the piston which will permit the liquidto flow in the reverse direction through the piston when the latter ismoved toward the discharge opening.

JOHN M. KELLEY.

